Keyhole guard



L'G. STOLPE. KEYHoLE GUARD. APPLICATION FILED SEPT-2. 1,919.

Patented Apr. 18,

250),; @www IFLII'IIIJ l WFVI IIIWMIIIWHL ing drawings, in which- I Fig. 1 is acentral' sectional view of aj Unirse STATES PATT @im i' JOHN G. s'roLPE, or WORCESTER., MAssAcHUsn'r'rs.

` KEYHOLE GUARD.

To all whom it lWbb/'y concern.' Y

Be it known that I, JOHN G. Sfronrma subject of lthe King of Sweden, residing at 'Worcester,' `in the county of Worcester and State of Massachusetts, have invented a new and useful Keyhole Guard, of which the following is a speciiication.. I A

This invention relates yto a guard for covering thekey-hole ofY a lock ,forany kind of a door but particularly adapted'for locking automobiles. Y. l j

The principal objects ofthe invention are to provide a simple construction whichwill cover the key-hole in such a way that itV can not b e tampered with or entered and vet will bev easily opened by the owner; and to combinel it with a scale to indicate tothe owner the position in which it canv beopened; also to providel a construction; of this character which will be simple and of suchnature that it `will not easily get out oforder and will protect the parts so that.

1 means of' a circular flangeV 23?, entering-the Y so This ring 23 is secured bya screw or'other they will not be injured by the weather.

Further objects and advantages lof theV `invention will appear hereinafter.

accomp any1 be-of any desired shape but shown as sub{.

Reference vis toy be had to the preferred form' of this invention;

Fig. 2'is a front elevationof the same;

Fig.I 4 is a 'sectional view on the line 'f Fig. 5 is anrelevation lofone of vthe scale rin s'; f Y ig.

6 is a similar .viewof cooperates with 1t; y

' Figj' is .a sectional yview on the line v(1-7 of Fig. 5;

Fig. 8 is a sectional view on the linej 8 8 z lig. 9 is an elevation of the lockingplate; .lan i Q Fig.v 10 is a view-showing the elements of' rthe gearing detached from each other.

' This invention is'designed to guard a key-' hole-10 of any kind of lock, as for example, `the lock 11.v The character-ofthe lock is not material but the linvention-lis particularly 'adapted for automobile locks. By means of Y screws-12 or the like,` a casing 13-is secured".V

' over the key-hole 10. lThiscasingis provided with anl inner frontwalllf having a pas* fllr'haveshown-this passage as of key stone;

sage '15 therethrough, of non-circularv shape.A

' point.

the Y'ring thatpa'blel otrotating on` its own aXis,"":takingj Ywith it thering23. Theseprojections??l constitute a non-circular outline of the same I shape as the perforation 1,8 which'constivcan beused iii'arranged eccentrically." Y

-The casing is :also provided 'with an outer tion 18. f This could lhe of'thesameshape vas the passagey15 ifd'esiredj,jor any other shape j l Patented Apr. 18,1922. Appnatioii filed september 2, i919; Aseriali no. 321,059.

Y Y6o y extension lpreferably circular in forni and having what I call an exterior wall 17 which kalso is provided with a non-'circular perforathat is4 noni-circular or eccentric, but I- haveecircularrecess in which' is locateda ring 2O on which zis mounted another .riiig- 21 in shown it being of vageneral circular form'.Y Y with notches 19L Outsidethis wall'17 is a Xed'position, but preferably circumferen-Hl tially adjustable.' This'ring is provided with a 'scale 22' which needfnot extend throughout the circumference or with azero In anunder-cut groove 24: within this ring ris a rotatable ring 23 having a circular scale'- preferably'` extending' throughout' its circumference, and heldin place by under-cut groove.

key 25"-to a rotatable member 26 which may stantiallyhemispherical and'formed .of solid metal or glass.v This meinber'26fis provided tutes a bearing-therefor.v

-Atthe center ofl'the'mernber .26 lit i'sprol videdwitha shaft; 30; headed g. atuone end and centrally screwedintol'the" member 26 atthe other. On this shaft is keyedv a gearl l31k meshing with a smaller gear-32 which is f1 'mounted on a bushing" 33 rotatablev on a' :ishattfli screwed into the wall 14.1V These parts are located in a depressionin thejrear fac`e-of this member 26: M f -1 f j Also keyed on the bushing' 33lisa larger V with a 'projection "or projections 27,"shown in this'instanoe as consisting of three parts 1` fitting in the notches 19. These-three parts fas shown, areso arranged-thatthe' member.` :26 vcan not be pushed back to its seatas shown in Fig. 1,'until turned to register gezin-35 meshing with. a smaller .gear y36 mounted onla loushingf?V` rotatable on the shaft 30. vTothis bushing 37, isv keyed.Y a.V plate 38. It.is shown as ofthe sameshape and size as the passage 15, but at an rate it is so made that the plate 38 can' e removed from behind the passage l5 and through it only when it is turned to one position. Its outline is noii-circular or eccentric. v

It will be obvious that when the member 26 is tui'ned, the plate 38 will be turned by the gearing at a different rate and will make a plurality of complete revolutions and a fraction of a revolution in addition While the member l26 is making one. It will also be obvious that the member 26 can not be removed except when the plate 88 is in a definite position, nor can it be removed except when the projections 27 are in a definite po-y sition. Either one of these may be in the right position without the other one regis-rk tering, and thus la certain combination has to be effected before the protecting member 26 can be removed. To unlock it, the mem-A ber 26 must be rotated a certain number of times and brought back to its Zero or entering position. This isrepresented by a number on the scale 23 which number` must coincide with the zero point or some other specified point on the scale 22 before the lock can be reached by the key.y In other Words, this device furnishes means by which a combination lock is provided to prevent access to the key-hole of the lock. The

mechanism is self-contained, that is removable with the member 26.

Although I 'have described and illustrated only a single form of my'invention, I am aware of the fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims.

Therefore I do not wish to` be limited to all the details of construction and combinations of parts herein-shown and described, but what I do claim is 1. In a key-hole guard, the combination with a casing for covering a key-hole, said casing having a non-circularpassage therethrough, and a bearing provided with a non-circular perforation in its outer wall,

of a member rotatably mounted in said.

bearing andhaving a non-circular projec` tion littingsaid perforation and normally located behind said outer wall, whereby it is adapted to be withdrawn through the perforation when4 located in a certain position, afplate, of the same shape as said non-circular passage, carried by said member, and

i normally located in the casing behind said V.memberis turned,.but at a diiferent speed.

2. In aY key-hole guard, the combination off-a casing adapted to be secured on the' front of a lock to cover thei key-hole, saidpassage and capable of being withdrawn only when in a certain position or positions, and means'for turning said plate when said casing having a passage therethrough and a bearing outside of the passage having aperforation through its outer wall, a member for covering said casing and preventing access to the interior thereof, mounted to rotate in said bearing and having a fixed projection of a shape to permit it to be 1nserted and withdrawn only when turned' to a certain position with respect to the perforation in the wall of said bearing, a shaft centrally carried by said member and fixed thereto and projecting through said `perforation and passage, a plate rotatably mounted on said shaft beyond said passage inside and so shaped and located with respect to said passage as to be capable of being inserted and withdrawn only when turned to aV f'ertain position, andv means whereby the lrotation of said member will be transmitted to said plate, but ata different speed.Y

8. In a key-hole guard, t-he combination of a casing for covering a key-hole having al passage, a rotatable member adaptedY to cover said passage to prevent access to the interior of the casing, gearing carried by said member on its inner face inside said casing, aA locking plate of the same shapey as said passage and adapted to be withdrawn therethrough vwhen ina certain position, and means for connecting said plate with said' gearing so as Vto rotate it at a different speed from that of saidv rotatable member when the latter is rotated.

4;. In a key-hole guard, the combination of a casing for covering a key-hole having a noncircular passage, a. rotatable member adapted to cover said passage to prevent access to the interior, of the casing, gearing carried by said.- member on itsinner face,

a locking plate ofthe same shape as said passage, said plate beingk connected with said gearing to be rotated thereby at a greater speed than said rotatable member, and means independent of said locking plate whereby said rotatable member can be removed only `when rotated to a pre-determined position.

5. In a key-hole guard, the combination of a casing for-covering a key-holerhavingl a non-circular passage, a rotatablel member adapted;v to cover said passage to prevent access to the interior of the casing, gearing connected with .said member onf its/'inner face, Va locking plate of the same shape` as said passage, said-plate being connectedy with vsaid gearing to be rotated thereby at a greater speed than said rotatable member, whereby said member can be removed only whenfrotatedto a pre-determinedV position, a ring Y carried byV said'rotatable member'and rocasing having a non-circular passage therethrough and a ybearing provided with a non,-

circularperforation in its outer wall,jof a member rotatably mountedin said bearing and having a non-circular projection fitting said perforation and normally located behind said outer wall, whereby it is adapted- Y to' be withdrawn through the perforation vwhen located in a certain position, a plate of the same shape as said non-circular passage carried by said member, and normally' is carried with said rotatable member and `the other stationary, for showing when said4 projection is in proper position to permit the removal of said member from the casing, and when the member hasbeen rotated times enough `to bring the plate alsorinto registration withr s aid passage.

7. In a key-hole guard, the combination or' a. casing for `covering a key-hole provided Vwith a bearing, amember rotatably mounted. in said vbearing,.and having an inner projection behind thebearing, said bearing having a shape corresponding with said proj ec# tion to prevent said member Jfrom being drawn out through the bearing except when in a pre-determined position, means rota# tably carried by said member and rotatable at a different speed for independently pre- Y venting the removal of said memberexcept When. in a pre-determinedposition, and -a circular scale and zero point, one of which is carried VVwith said rotatable member and the other of which is stationary for lshowing when said projection 4is in proper position to permit the removal of vsaid member from vthe casing. Y. y.

8. 1n al key-hole guard, the combination of a casing for coveringthe key-hole having y a passage therethrough, and a` bearing, 'amember rotatably mounted in said bearing s. toV

and having means whereby it is prevented Y from being removed 'from the'bearing except when'in a pre-determined position,` a plateV Y rotatablymounted with respect `tofsaid rotatablemember and adapted to be Withdrawn through said passage, said plate and passage boeing of such shape and location that the plate can not be drawn out through said 'passage except when located in a'detiniteposition, said plate being located vnormally behind the passage, means operated byV said rotatable member for'turningsaid Vplate at a dierent speed from said memberwhen said member is rotated, and a circular. scale and zero point, one of which is carried with said rotatable memberV and the other sta-V tionary for showing when said plate is inproper position to permit the removal of said member from 'the casing. 'f

In testimony whereof -I have hereunto aiiixed lmy signature.

Y JOHN e. sToLPn 

